vertexdata

OpenGL vertex buffer confusion

由 泪湿孤枕 提交于 2021-02-17 12:45:50
问题 Would someone care to explain the difference to be between a VertexBuffer , a VertexArray , a VertexBufferObject , and a VertexArrayObject ? I'm not even sure if these are all terms for different things, but I've seen all of them appear in the OpenGL spec. I know that a VertexBuffer simply contains vertices and nothing else, once bound, and once I've set the vertex pointers, I can use DrawArrays to draw it. I've done it this way many times. I am using what I think is a VertexArray, which

From dataframe to vertex/edge array

由 核能气质少年 提交于 2019-12-22 05:28:13
问题 I have the dataframe test <- structure(list( y2002 = c("freshman","freshman","freshman","sophomore","sophomore","senior"), y2003 = c("freshman","junior","junior","sophomore","sophomore","senior"), y2004 = c("junior","sophomore","sophomore","senior","senior",NA), y2005 = c("senior","senior","senior",NA, NA, NA)), .Names = c("2002","2003","2004","2005"), row.names = c(c(1:6)), class = "data.frame") > test 2002 2003 2004 2005 1 freshman freshman junior senior 2 freshman junior sophomore senior 3

assign a (numeric real) value to vertex in network graph

由 别说谁变了你拦得住时间么 提交于 2019-12-11 18:54:45
问题 I wanted to assign or associate each node in the network plot with some real value (say some score) in R . Which need to be updated in iterations. Finally to plot the network graph with size of vertex according to its latest value (score). Which property of a vertex I can use for this purpose and how? If it's not possible in igraph , is there any other way to achieve this purpose in R ? I'm new to R . Anybody please help me to sort out this problem. 回答1: I create my gaph graph2 <- read.table

From dataframe to vertex/edge array

由 余生颓废 提交于 2019-12-05 06:15:45
I have the dataframe test <- structure(list( y2002 = c("freshman","freshman","freshman","sophomore","sophomore","senior"), y2003 = c("freshman","junior","junior","sophomore","sophomore","senior"), y2004 = c("junior","sophomore","sophomore","senior","senior",NA), y2005 = c("senior","senior","senior",NA, NA, NA)), .Names = c("2002","2003","2004","2005"), row.names = c(c(1:6)), class = "data.frame") > test 2002 2003 2004 2005 1 freshman freshman junior senior 2 freshman junior sophomore senior 3 freshman junior sophomore senior 4 sophomore sophomore senior <NA> 5 sophomore sophomore senior <NA> 6

What is a good code structure for api-independent vertex processing? [closed]

由 南笙酒味 提交于 2019-12-04 17:35:57
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed last year . Currently working on a 3D media engine using C# and I have come across a little conundrum. I have my rending loop figured out, I got a great plug-in architecture and content management system and even a material pipeline all planned out. Then engine is planned to use DirectX

What is a good code structure for api-independent vertex processing? [closed]

由 血红的双手。 提交于 2019-12-03 11:03:53
Currently working on a 3D media engine using C# and I have come across a little conundrum. I have my rending loop figured out, I got a great plug-in architecture and content management system and even a material pipeline all planned out. Then engine is planned to use DirectX and OpenGL (via 'renderer' plug-ins), along with both APIs' programmable pipe-line. Anyways, at the beginning of this week I started on working on the engines abstract layer for processing vertices (I have been dreading this for weeks now). And as some of you know, vertex handling between graphic APIs' is not at all
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